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You beat me to it! LOL!!If you know a counterman at a local GM dealer have him or her run the P/N through GM for the most up-to-date number. If you're lucky, one of the PDCs will still have it. If the part is obsolete, have the dealer check availability through the national parts locator network for NOS. That should provide the most current information. There are many dealers around the country with NOS lookin for a home.
I also have Parts and Illustration Catalogs for all of my vehicles. If you go to your Chevy Dealer they also have access to VPI. VPI is Vintage Parts, Inc. www.VPartsInc.comAs a consumer you do not have access to VPI, but that is where all of the manufacturers off-load their obsolete parts.